This is a bit annoying depending on the weather or other situations like using a fan or air conditioning, it tends to affect the Diamond Tester readings a bit. That being said, this is an exceptionally well made and well designed diamond tester that I recommend and is overall easy to use and operate. Very handy for gem collectors, I've successfully identified diamonds with mine before, so this really works and does what it says on the tin. Great for beginning collectors, I also think it's good value for money.
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